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Linux 6.2's Call Depth Tracking Helps Recover Lost Performance On Intel Skylake CPUs

The retbleed=stuff operation was also helping with the OpenJDK Java workloads in recovering the IBRS performance penalty on this Xeon Skylake server.

Across a wide variety of workloads, the Call Depth Tracking mitigation was showing to be clearly less impactful than the default IBRS mitigation for Retbleed.